package com.atguigu.yygh.gateway.config;

import com.atguigu.yygh.common.utils.JwtHelper;
import com.google.gson.JsonObject;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.nio.charset.StandardCharsets;
import java.util.List;

public class AuthGlobalFilter implements GlobalFilter, Ordered {


    private AntPathMatcher antPathMatcher = new AntPathMatcher();

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取ServerHttpRequest对象
        ServerHttpRequest request = exchange.getRequest();
        //获取请求路径
        String path = request.getURI().getPath();
        ///api/order 订单相关接口，校验必须登录
        if(antPathMatcher.match("/api/order/**", path)) {
            //获取请求头
            List<String> tokenList = request.getHeaders().get("token");
            //判断：如果token是否为空
            if (null == tokenList) {
                ServerHttpResponse response = exchange.getResponse();
                return out(response);
            } else { //如果token不为空，判断token是否过期
                Boolean isCheck = JwtHelper.isExpiration(tokenList.get(0));
                if (isCheck) {
                    ServerHttpResponse response = exchange.getResponse();
                    return out(response);
                }
            }
        }
        return chain.filter(exchange);
    }

    //设置执行优先级
    @Override
    public int getOrder() {
        return 0;
    }

    //返回信息
    private Mono<Void> out(ServerHttpResponse response) {
        JsonObject message = new JsonObject();
        message.addProperty("success", false);
        message.addProperty("code", 28004);
        message.addProperty("data", "鉴权失败");
        byte[] bits = message.toString().getBytes(StandardCharsets.UTF_8);
        DataBuffer buffer = response.bufferFactory().wrap(bits);
        //response.setStatusCode(HttpStatus.UNAUTHORIZED);
        //指定编码，否则在浏览器中会中文乱码
        response.getHeaders().add("Content-Type", "application/json;charset=UTF-8");
        return response.writeWith(Mono.just(buffer));
    }
}
